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Extremely salty water is at least 100 million years old

Supersaline sediments off East Coast shed light on Atlantic Ocean’s early history

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1:00pm, November 13, 2013

SALTY SEA  The Chesapeake Bay holds a pocket of high-salinity groundwater that has been undisturbed since the Early Cretaceous, at least 100 million years ago.

Water, water, everywhere and some of it’s been undisturbed for more than 100 million years.

Groundwater collected from sediments at the mouth of the Chesapeake Bay is thought to be 100 to 145 million years old. The ancient samples, twice as salty as modern seawater, were already trapped in sediments when an asteroid or comet landed in the area some 35 million years ago, researchers report in the Nov. 14 Nature.

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